Rare Swiss stainless steel split-seconds chronograph Circa 1955

Stainless steel keyless lever by Omega
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A rare Swiss stainless steel keyless split-seconds chronograph with central 12-hour and 60-minute registers, circa 1955. A polished case, case back engraved C.D.A.P. 3, cuvette engraved Propiedad del Club Deportivo Automovilistico de Puebla A.L. White enamel dial with black painted Arabic numerals, inner 12-hour divisions, outer 60-minute divisions, outermost 60, 1/5th seconds divisions and blued steel feuille hands. A frosted gilt movement, 16 jewels, straight-line lever escapement, monometallic flat balance, Breguet balance spring, index regulator. Dial and movement signed. This watch is sold with a box and certificate of authenticity.
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Thickness: 27 mm
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Diameter: 65 mm
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Signed: Omega  Swiss